Area Forecast Discussion
Issued by NWS Dallas/Fort Worth, TX

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000
FXUS64 KFWD 240950
AFDFWD

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FORT WORTH TX
450 AM CDT FRI APR 24 2015

.DISCUSSION...
ACTIVE WEATHER APPEARS LIKELY ACROSS PORTIONS OF NORTH/CENTRAL
TEXAS FOR TODAY WITH A COUPLE OF ROUNDS OF SHOWERS AND
THUNDERSTORMS. WATER VAPOR IMAGERY EARLY THIS MORNING SHOWS A
LARGE BAROCLINIC LEAF AHEAD OF THE MAIN UPPER LOW NOW SWINGING
THROUGH THE SOUTHWEST US. AS THIS FEATURE MOVES TO THE EAST...IT
SHOULD HELP TO BREAK DOWN THE SHORTWAVE RIDGE THAT QUELLED
WIDESPREAD CONVECTION YESTERDAY. SURFACE ANALYSIS THIS MORNING
REVEALED THAT LEE SIDE-TROUGHING CONTINUED WITH SURFACE LOW
PRESSURE CENTERS ACROSS COLORADO AND ANOTHER LOW PRESSURE CENTER
ACROSS THE SOUTHERN TX PANHANDLE. A SLOWLY ADVANCING WARM FRONT
WAS LOCATED ROUGHLY FROM NEAR CHILDRESS TO FORT WORTH TO ATHENS.

THE AFOREMENTIONED WARM FRONT WILL SERVE AS ONE FOCUS FOR THE
FIRST ROUND OF SHOWERS AND STORMS THIS MORNING. AS THE UPPER
TROUGH NEARS...A FEW THINGS WILL HAPPEN TO INCREASE THE
PROBABILITY FOR PRECIPITATION. THE FIRST IS THAT BROAD TROUGHING
ACROSS THE TX PANHANDLE WILL CONTINUE. THIS SHOULD ALLOW THE WARM
FRONT TO LIFT NORTHWARD TOWARDS THE RED RIVER. SECOND...THE
AFOREMENTIONED TROUGH NOW ACROSS THE PACIFIC SOUTHWEST WILL
CONTINUE TO MOVE CLOSER TOWARDS N/C TX. THE DIVERGENCE ALOFT AND
MID LEVEL HEIGHT FALLS SHOULD FURTHER RESULT IN CONTINUED LOW
LEVEL THETA-E ADVECTION TOWARDS THE NORTH AS WELL AS INCREASE
ASCENT. BOTH OF THESE ARE ALREADY EVIDENT PER REGIONAL RADARS THIS
MORNING WITH CONVECTION ONGOING ACROSS OUR NORTHERN AND WESTERN
ZONES AS WELL AS ACROSS THE TX HILL COUNTRY. THE MAIN AREAS FOR
PRECIPITATION WILL BE ALONG THE WARM FRONTAL BOUNDARY WHICH SHOULD
BE LOCATED NEAR THE RED RIVER BY MID-MORNING AND ACROSS CENTRAL
AND THE EASTERN TWO-THIRDS OF OUR ZONES. WHILE WIDESPREAD SEVERE
WEATHER IS NOT ANTICIPATED THIS MORNING...SOME HEAVY RAIN AND
FREQUENT CLOUD TO GROUND LIGHTNING WILL BE POSSIBLE. CANNOT RULE
OUT A FEW INSTANCES OF VERY SMALL HAIL...BUT FORECAST PROFILES
APPEAR QUITE MOIST THIS AM.

THE DIFFICULT PART OF THE FORECAST WILL BE THE AFTERNOON STORM
CHANCES. AS WE HAVE SEEN IN THE PAST WEEK...MORNING CONVECTION CAN
OFTEN SUPPRESS AFTERNOON STORM CHANCES DUE TO THE AMOUNT OF
OVERTURNING AND SUBSEQUENT SUBSIDENCE IN THE WAKE OF STORM
COMPLEXES. IN SOME INSTANCES...THE ATMOSPHERE HAS THE ABILITY TO
RAPIDLY DESTABILIZE AND RECHARGE FOR A SECOND ROUND OF SHOWERS AND
STORMS WHEN STRONG UPPER LEVEL DYNAMICS ARE IN PLACE. WITH
REGARDS TO THE POTENTIAL AFTERNOON STORM CHANCES...WE WILL CARRY A
RELATIVELY BROAD BRUSH POP FORECAST /50 PERCENT/ MAINLY DUE TO
THE FACT THAT MUCH OF THE REGION WILL BE BENEATH THE RIGHT
ENTRANCE REGION OF A 50-60 KT MID LEVEL JET WHICH SHOULD PROVIDE
LARGE SCALE ASCENT. IN ADDITION...SURFACE DEWPOINTS IN THE 60S AND
70S SHOULD STILL YIELD A HEALTHY AMOUNT OF INSTABILITY. IF
SUFFICIENT DIABATIC HEATING OCCURS...THE ABILITY TO LIFT SURFACE
BASE PARCELS UP TO THEIR LFC WILL RESULT IN THE DEVELOPMENT OF
VERY ROBUST CONVECTION ALONG THE APPROACHING DRYLINE. THE DRYLINE
SHOULD MIX EASTWARD TOWARDS OUR WESTERN ZONES MID TO LATE
AFTERNOON REACHING THE I-35 CORRIDOR AROUND 6 PM.

WITH CAPE VALUES EXPECTED TO CLIMB UP TO 2000 J/KG AND DEEP LAYER
SHEAR VALUES ON THE ORDER OF 45-50 KNOTS...SUPERCELLS WILL BE
POSSIBLE...POSSIBLY GROWING UPSCALE INTO LINE SEGMENTS. THE MAIN
HAZARDS WITH THUNDERSTORMS THIS AFTERNOON AND EVENING /SHOULD THEY
DEVELOP/ WILL BE VERY LARGE HAIL AND DAMAGING WINDS...BUT BACKED
LOW LEVEL FLOW SHOULD RESULT IN A FAVORABLE WIND PROFILE
SUFFICIENT FOR A TORNADO OR TWO AS WELL. WITH THE UNSEASONABLY
HIGH MOISTURE CONTENT...HEAVY RAINFALL WILL ALSO BE POSSIBLE. THIS
MAY LEAD TO AREAS OF LOCALIZED FLOODING.

FOR TONIGHT...THE DRYLINE/PACIFIC FRONT SHOULD MOVE EASTWARD INTO
THE PINEY WOODS OF EAST TEXAS. SKIES SHOULD CLEAR FROM WEST TO
EAST WITH WEST TO SOUTHWEST WINDS OF 5 TO 10 MPH. THE EXCEPTION
MAY BE ACROSS FAR SOUTHEAST ZONES. AS A RESULT OVERNIGHT LOW
TEMPS SHOULD BE COOLEST IN THE NW /MID 50S/ TO LOW TO MID 60S
ELSEWHERE.

FOR SATURDAY AND MOST OF SUNDAY...WARM CONDITIONS AND DRY
CONDITIONS SHOULD EXIST AS WARM SOUTHWEST TO WEST-SOUTHWEST WINDS
SHOULD OVERSPREAD THE AREA IN THE WAKE OF THE DRYLINE/PACIFIC
FRONT. THIS FAVORABLE DOWNSLOPE WIND SHOULD ALLOW TEMPERATURES TO
SOAR INTO THE MID TO UPPER 80S. A FEW SITES ACROSS THE WESTERN
ZONES MAY EVEN CLIMB INTO THE LOW 90S. SUNDAY APPEARS TO BE WARM
AS WELL...THOUGH WINDS SHOULD TURN A BIT MORE TO THE SOUTH /A
LITTLE LESS DOWNSLOPE/ AND THIS MAY RESULT IN SLIGHTLY COOLER
TEMPERATURES. THE EXCEPTION WILL BE FAR NW ZONES WHERE SW WINDS
MAY CONTINUE. MOST OF THE GLOBAL MODELS ARE IN FAIR AGREEMENT THAT
A LARGE UPPER TROUGH WILL DIVE DOWN THROUGH THE FOUR CORNERS
REGION AND INTO FAR WEST TEXAS. THE SUBSEQUENT LEE-SIDE TROUGHING
SHOULD HELP TO DRAW LOW LEVEL MOISTURE TO THE NORTH. THIS WILL
ALLOW A DRYLINE TO SHARPEN NEAR OR OUR WESTERN ZONES. WHILE IT IS
A LITTLE TOO EARLY TO GET OVERLY DETAILED...THERE DOES APPEAR TO
BE A FAIR AMOUNT OF BOTH INSTABILITY AND SHEAR FAVORABLE FOR
SEVERE WEATHER.

FOR THE LONGER TERM PERIOD...RAIN CHANCES AND THE POTENTIAL THREAT
FOR SEVERE WEATHER WILL CONTINUE THROUGH MONDAY AS THE UPPER LEVEL
LOW BECOMES SOMEWHAT CUTOFF FROM THE MAIN FLOW.
AGAIN...INSTABILITY AND SHEAR PARAMETERS STILL APPEAR FAVORABLE
FOR SOME SEVERE WEATHER. IT DOES APPEAR THAT A TRUE COLD FRONT
WILL PLOW SOUTHWARD THROUGH NORTH/CENTRAL TEXAS AROUND TUESDAY AND
THUS THE THREAT FOR SEVERE WEATHER WILL LIKELY COME TO AN
END...BUT THE RAIN CHANCES WILL CONTINUE ON TUESDAY. THE COLD
FRONT SHOULD USHER IN COOLER AND DRIER WEATHER FOR MID TO LATE
WEEK.

15-BAIN

&&

.AVIATION...

/ISSUED 1159 PM CDT THU APR 23 2015/
/6Z TAFS/

AN ACTIVE PATTERN IS EXPECTED OVER THE NEXT 24 HOURS ACROSS NORTH
TEXAS. CURRENTLY VFR CONDITIONS PREVAIL ACROSS MOST OF THE
REGION...ALTHOUGH THERE ARE POCKETS OF IFR/MVFR CIGS NEAR THE
METROPLEX AND NORTHEAST OF THERE. WARM FRONT IS SLOWLY LIFTING
NORTHWARD AND CIGS SHOULD LIFT AS IT PASSES NORTH. LOWER CIGS WILL
AGAIN SPREAD NORTH LATER TONIGHT. COMPLEX OF SHOWERS AND
THUNDERSTORMS OVER THE BIG BEND REGION IS LIKELY TO SPREAD
NORTHEAST OVERNIGHT AND CURRENT THINKING IS THAT SOME OF THESE
SHOWERS AND STORMS WILL AFFECT AREA AIRPORTS DURING THE EARLY
MORNING HOURS. HAVE INTRODUCED AT TEMPO FOR -TSRA FROM 10-13Z AT
THE MAJOR AIRPORTS. THIS ACTIVITY WILL LIKELY IMPACT WHAT HAPPENS
LATER IN THE DAY. AS STRONGER FORCING AND A PACIFIC FRONT MOVES
EAST LATER IN THE DAY...ADDITIONAL THUNDERSTORMS ARE EXPECTED TO
DEVELOP. AS OF NOW...THIS APPEARS LIKE IT WILL OCCUR VERY NEAR
INTERSTATE 35...OR EAST OF THERE. STORMS SHOULD MOVE EAST QUICKLY
AND END BY EARLY EVENING. VFR CONDITIONS EXPECTED TOMORROW NIGHT
THROUGH THE END OF THE PERIOD.

DUNN


&&

.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH, TX  81  64  87  62  87 /  60  30   5   5  30
WACO, TX              81  63  88  62  88 /  70  40   5   5  30
PARIS, TX             74  64  85  58  85 /  70  40   5   5  10
DENTON, TX            81  61  86  58  86 /  60  30   5   5  40
MCKINNEY, TX          79  62  86  57  87 /  70  30   5   5  30
DALLAS, TX            82  65  88  65  87 /  60  30   5   5  30
TERRELL, TX           78  63  86  61  86 /  70  40   5   5  20
CORSICANA, TX         80  65  88  64  86 /  70  40   5   5  20
TEMPLE, TX            81  63  88  65  86 /  70  40  10   5  30
MINERAL WELLS, TX     80  58  88  58  88 /  60  10   5   5  40

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

$$

92/15



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